Cutting tool



F. E. BLANC Jun 30, 1936.

CUTTING TOOL ori inai Filed Nov. 18, 1930 Reissued June 30, 1936 UNITED STATES PATENT OFFICE CUTTING TOOL Francis E. Blane, New Westminster, British Columbia, Canada 3 Claims.

My invention relates to diamond drilling and has for its object to provide a new and efficient cutting tool for cutting out core barrels and rods which have been broken off and lodged in the hole being drilled.

A further object is to provide a cutting tool for use in diamond drilling which tool is used to cut out steel lost in the hole, said tool being provided with water conduits and ducts adapted to carry off the cuttings in the most satisfactory manner.

A still further object is to provide a cutting tool which will be quick acting, efficient and economical to manufacture and use.

These objects I accomplish with the device illustrated in the accompanying drawing in which similar numerals and letters of reference indicate like parts throughout the several views, and as described in the specification forming a part of this application and pointed out in the appended claims.

In the drawing in which I have shown the best and most preferred manner of building my invention Figure 1 is a side elevation of the device. Figure 2 is a section on line 22 of Figure 1. Figure 3 is a side elevation of Figure 2. Figure 4 is a modified form of constructing the cutting tool when the core is not used but a cutting blade is mounted on the end of the tool.

In the drawing I have shown the cutting tool as made of a cylindrical body A, having a bore B centrally therethrough and having the top end I externally threaded and of smaller diameter than the rest of the tool. This threaded portion is to be screwed into the threaded end of the drilling rod. The central bore is to allow for flow of flushing and cleaning water therethrough. The lower end of the core pilot 2 of the body A is made of smaller diameter to fit into the bore of the broken ofi rod or barrel and has slots 3 formed longitudinally therein to aid in cleaning the hole of cuttings. Diagonal ports or water fiow holes 4 are bored through the body at an angle to the central bore to aid in cleaning the hole, but such holes may be plugged when desired and other holes bored to take their place, depending on the circumstances under which the tool is being used.

Diametrically across the lower end of the body A, I provide a slot 5 the body of which slot is longitudinal with the body A of the tool and a cutting blade C is placed in said slot with the ends 6 extending beyond the edges of the body the same diameter of the hole in which the tool is being used. The lower edge 6 of the blade is cut at an. angle to provide a cutting face I which face is adapted to cut away the rod or barrel with which it comes into contact. The slot is formed across the body A and the upper end of the core 2, so that the cutting edge of the tool is below 5 the level of the body A. Across the core pilot 2 at right angles to the slot 5 I provide a tapered hole 8 in which a tapered pin 9 is driven to engage a notch ID in the lower edge of the blade C, raising the blade C to the top of the slot 5 and 10 securely holding the blade in place in the tool. The top side of the blade is formed with shoulders I I one on each side thereof said shoulders to fit against the outer edge of the body A when the pin 9 has been driven into the hole 8, raising the blade to its proper cutting position, said shoulders, to aid in holding the blade secured in the tool body A. Each side face of the blade C is cut away in a curved groove I2, to provide space around the tool for flow of water through the bore B around the blade.

The type of tool shown in Figure 4 is formed of a body, having a slot formed across the bottom end thereof in which a cutting blade G is carried. The blade is secured in the body by a tapered pin [3 being driven into a tapered hole l4 raising the blade until the shoulders l5 are along the side of the body F and the hole I4 is through the body F. In this type of tool, there is no core formed thereon, as this type is for cutting out obstacles which have had their bores closed either by cuttings or other obstacles such as cement. etc.

It will be obvious that slight modifications may be made in the device to meet varying conditions of cutting without departing from the spirit of the invention or the scope of the claims.

The operation of the tool is as follows:--

The body A is screwed into the drilling rod and the tool or blade C is secured in the body. The rod is then let down the hole until the blade engages the rod or barrel to be cut. The core is placed in the bore of the rod or barrel and the rod is then rotated, rotating the tool and cutting oil the rod or barrel, and water is pumped through the bore of the rod and tool to carry out the cuttings.

Having thus described my invention I desire to secure by Letters Patent and claim:-

1. In a cutting tool of the class described the combination of a cylindrical body having the top end of smaller diameter and externally threaded and with a transverse slot across said body at the lower end thereof with the lower end extended into a guide core; longitudinal slots in the core of said body; a cutting blade carried in diametrically opposite slots through said body, said blade having the opposed lower edges sharpened; a tapered pin driven through a hole in said body under said blade and at right angles thereto to hold the blade fixed in relation to said body; ports through said body above said blade to direct water currents therethrough; and means to allow water to be pumped through the ports and the longitudinal slots to carry the cuttings of the blade.

2. A tool as described consisting of a shank having a cutter carrier, a cutter in said carrier extending transversely through and beyond the outer circumference of the carrier, said shank having an internal coaxial bore, the carrier contained portion of the cutter having opposing grooves permitting passage of a fluid therethrough and through the bore, the area of the shank below the cutter having a longitudinal slot opening out of the bore and the area of the shank above the cutter having upwardly diverging channels opening into the bore in immediate vicinity of said groove and opening out of the outer surface of the shank.

3. A tool of the kind described having an elongated core pilot having an elongated slot therein, a core pin of tubular formation located oppositely to said core pilot, an intermediate cutter carrier, a cutter seated in said carrier and having cutting edges external to the latter and having provision for conducting fluid from the core pin to the core pilot, said carrier having fluid channels communicating with said bore for the receipt of Water and shaped to divert water externally of the carrier above the cutter, and by way of the cutter into the core pilot.

FRANCIS E. BLANC. 

